epan/dissectors/packet-telkonet.c

   1 /* packet-telkonet.c
   2  * Routines for ethertype 0x88A1 tunneling dissection
   3  *
   4  * Copyright 2006 Joerg Mayer (see AUTHORS file)
   5  *
   6  * Wireshark - Network traffic analyzer
   7  * By Gerald Combs <gerald@wireshark.org>
   8  * Copyright 1998 Gerald Combs
   9  *
  10  * SPDX-License-Identifier: GPL-2.0-or-later
  11  */
  12
  13 /* 2do:
  14  * - find out more about the real meaning of the 8 bytes
  15  *   and possible other packet types
  16  * - Telkonet (www.telkonet.com) has registered other ethertypes
  17  *   as well: find out what they do
  18  */
  19
  20 #include "config.h"
  21
  22 #include <epan/packet.h>
  23 #include <epan/etypes.h>
  24
  25 void proto_reg_handoff_telkonet(void);
  26 void proto_register_telkonet(void);
  27
  28 static int proto_telkonet;
  29 static int hf_telkonet_type;
  30
  31 static int ett_telkonet;
  32
  33 static dissector_handle_t telkonet_handle;
  34 static dissector_handle_t eth_withoutfcs_handle;
  35
  36 typedef enum {
  37         TELKONET_TYPE_TUNNEL = 0x78
  38 } telkonet_type_t;
  39
  40 static const value_string telkonet_type_vals[] = {
  41         { TELKONET_TYPE_TUNNEL, "tunnel" },
  42
  43         { 0x00, NULL }
  44 };
  45
  46 static int
  47 dissect_telkonet(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
  48 {
  49         proto_tree *ti, *telkonet_tree;
  50         int offset = 0;
  51         telkonet_type_t type;
  52
  53         col_set_str(pinfo->cinfo, COL_PROTOCOL, "TELKONET");
  54         col_clear(pinfo->cinfo, COL_INFO);
  55
  56         type = (telkonet_type_t)tvb_get_uint8(tvb, offset);
  57         col_add_fstr(pinfo->cinfo, COL_INFO, "Telkonet type: %s",
  58                 val_to_str(type, telkonet_type_vals, "Unknown (0x%02x)"));
  59
  60         ti = proto_tree_add_item(tree, proto_telkonet, tvb, 0, 8, ENC_NA);
  61         telkonet_tree = proto_item_add_subtree(ti, ett_telkonet);
  62
  63         proto_tree_add_item(telkonet_tree, hf_telkonet_type, tvb, 0, 8, ENC_NA);
  64         offset += 8;
  65
  66         if (type == TELKONET_TYPE_TUNNEL)
  67                 call_dissector(eth_withoutfcs_handle, tvb_new_subset_remaining(tvb, offset),
  68                         pinfo, tree);
  69
  70         return tvb_captured_length(tvb);
  71 }
  72
  73 void
  74 proto_register_telkonet(void)
  75 {
  76         static hf_register_info hf[] = {
  77                 { &hf_telkonet_type,
  78                 { "Type", "telkonet.type", FT_BYTES, BASE_NONE, NULL,
  79                         0x0, "TELKONET type", HFILL }},
  80         };
  81         static int *ett[] = {
  82                 &ett_telkonet,
  83         };
  84
  85         proto_telkonet = proto_register_protocol("Telkonet powerline", "TELKONET", "telkonet");
  86         proto_register_field_array(proto_telkonet, hf, array_length(hf));
  87         proto_register_subtree_array(ett, array_length(ett));
  88         telkonet_handle = register_dissector("telkonet", dissect_telkonet, proto_telkonet);
  89 }
  90
  91 void
  92 proto_reg_handoff_telkonet(void)
  93 {
  94         eth_withoutfcs_handle = find_dissector_add_dependency("eth_withoutfcs", proto_telkonet);
  95
  96         dissector_add_uint("ethertype", ETHERTYPE_TELKONET, telkonet_handle);
  97 }
  98
  99 /*
 100  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 101  *
 102  * Local variables:
 103  * c-basic-offset: 8
 104  * tab-width: 8
 105  * indent-tabs-mode: t
 106  * End:
 107  *
 108  * vi: set shiftwidth=8 tabstop=8 noexpandtab:
 109  * :indentSize=8:tabSize=8:noTabs=false:
 110  */